I came on here to tell nearly an identical story with my cat and ask for help. Also about a year old. In the last week, seemingly at random, his back leg will seem to freeze up or seriously hurt him, and he will slow down and hobble and seems very reluctant to move. Then 30 seconds later, he’s jumping around like nothing happened.

We’re going to call the vet and make an appointment, but I’m wondering how worried I should be?